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TOPIC: BB140A interchange with AQ120A?

BB140A interchange with AQ120A? 18 Jun 2009 23:07 #1

  • BrooklynJim
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hi again, finally found out i have twin BB140a twin carb engines in my 3270, which has brought up another question for you gurus.. :D:D


i have an old AQ120B in my garage, was rebuilt several years ago at an extensive cost, ran for about 20 hours (break in) and transom seperated on that little dinghy i had back then :), is this block interchangable with the BB140?

ive searched thru parts vendors and come up with diagrams indicating multiple engine interchange for the same parts.. but just need to make sure to decide if i should keep this as a spare or sell it and look for a spare..

ive already noted that the intake obviously is differant, BB140 = split manifold and twin carbs, AQ120B=plenum manifold and single carb, but is that the only difference between these engines? aside from age?

thanks again fellas

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Bayliner 3270
"MARAKI"
Twin Crusader CH220's
(repowered)
Important Notice"
DUE TO RECENT BUDGET CUTS, STOCK MARKET PERFORMANCE, RISING COST OF ELECTRICITY, GAS AND OIL...
THE LIGHT AT THE END OF THE TUNNEL HAS BEEN TURNED OFF....
WE APOLOGIZE FOR THE INCONVENIENCE
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THE GOVERNMENT
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BB140A interchange with AQ120A? 19 Jun 2009 19:48 #2

  • 2850Bounty
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Since I don't do a whole lot with these on a regular basis, I asked our friend El P over at the MarineEngine's forum..... here is his response.

Morning, Ricardo.

Both the AQ120B and the AQ140A have a B21 block so the base engines are virtually identical. However, they have a different carb and intake manifold configuration and the cams are different : the AQ140A has a V cam and the AQ120 has an A cam. No big deal, all those parts can be swapped if needed. Also, the oil pumps could be different depending on the year of manufacturing, but that should not affect the performance.

In short, it is my opinion that his AQ120B will make a good spare engine.

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
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BB140A interchange with AQ120A? 20 Jun 2009 01:24 #3

  • BrooklynJim
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2850Bounty;312175 wrote: Since I don't do a whole lot with these on a regular basis, I asked our friend El P over at the MarineEngine's forum..... here is his response.



In short, it is my opinion that his AQ120B will make a good spare engine.



wow rick.. thanks so much for taking the time and for the priceless info..

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Bayliner 3270
"MARAKI"
Twin Crusader CH220's
(repowered)
Important Notice"
DUE TO RECENT BUDGET CUTS, STOCK MARKET PERFORMANCE, RISING COST OF ELECTRICITY, GAS AND OIL...
THE LIGHT AT THE END OF THE TUNNEL HAS BEEN TURNED OFF....
WE APOLOGIZE FOR THE INCONVENIENCE
Regards
THE GOVERNMENT
[/SIZE]
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